Insulating A Flat Roof From Outside

The insulation material is placed between the supporting joists leaving a gap of 50 60mm between the roof and insulation.

Insulating a flat roof from outside.

Materials used to make insulation in these three types include mineral wool fiberglass cellulose fiber vermiculite styrofoam polystyrene and polyurethane. The correct method for a flat roof is under the current regulations to have a warm roof. Insulated roof assemblies can be vented or unvented. Use rigid foam insulation panels on your flat roof before applying the final roof covering or inside the house before adding sheetrock or paneling.

Reduce extreme temperature fluctuations inside your home. Not cheap but needs to be done right either way. A roof over a vented unconditioned attic does not need to include any insulation. I explain problems with insulating a roof using the warm and cold roof construction methods.

Unfortunately too many dwellings suffer from this problem. While insulation for a flat roof is expensive and can account for as much as 25 of the total installation cost there are a number of important benefits to having it in place. When you have an un insulated roof you have to live with. Like other roofs insulating a flat one requires ample ventilation a vapor barrier and sealed bypasses.

They lose loads of heat and are prone to leaking causing the materials to deteriorate. However most cathedral ceilings and low slope flat roofs are insulated roof assemblies. To produce a hot roof rigid insulation is fitted outside above the weatherproofing. Or insulate partially on the exterior side of the roof sheathing with an air control layer insulate in the rafters bays control the vapor diffusion and re work the fascia soffit etc.

You would only do this however if replacing the roof covering on top and you have the height above the roof to do this. Why its important to insulate your flat roof. The material that works best depends largely upon preference in a given situation. Cold roof systems are highly inadvisable as insulation from the inside will inevitably lead to the formation of condensation.

Cold roof a very bad idea. Many properties use this option as there are no additional costs for scaffolding or organising how to gain safe access to the roof exterior. With this kind of roof the insulation follows the slope of the roof. Fur down the rafters for more r value after evaluation air seal insulate and control the vapor diffusion.

Whatever new flat roof covering you choose epdm rubber kemper. Rigid foam panels are available in thickness.